ED is an abbreviation for extra low dispersion, which describes a property of manufactured glass that is used to make lenses for cameras and telescopes including APO refractors.

Extra low dispersion (ED) glass prevents chromatic aberration due to the fact that it concentrates and directs the wavelength of light more effectively onto the focus point of the light path.

Lenses made from extra low dispersion glass are noted to have fewer air bubbles and deformities of their glass lenses which means they are less likely to cause image distortion in the resulting image.

Posting Permissions

Posting Permissions
  • You may not create new articles
  • You may not edit articles
  • You may not protect articles
  • You may not post comments
  • You may not post attachments
  • You may not edit your comments
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 03:43 PM.